Underground Measurements of Aerosol and Activity Distributions of Radon and Thoron Progeny

1987 ◽  
pp. 219-238 ◽  
Author(s):  
Atika Khan ◽  
Frank Bandi ◽  
Richard W. Gleasure ◽  
Colin R. Phillips ◽  
Philippe Duport
Keyword(s):  
Thoron Progeny

Study of indoor radon and thoron progeny levels in surrounding areas of Nalbari, Assam, India

2009 ◽  
Vol 83 (7) ◽  
pp. 1025-1030 ◽  
Author(s):  
P. C. Deka ◽  
H. Sarma ◽  
Subir Sarkar ◽  
T. D. Goswami ◽  
B. K. Sarma
Keyword(s):  
Indoor Radon ◽  
Surrounding Areas ◽  
Thoron Progeny

EFFECT OF AIR VELOCITY ON INHALATION DOSES DUE TO RADON AND THORON PROGENY IN A TEST CHAMBER

2020 ◽  
Vol 189 (3) ◽  
pp. 401-405
Author(s):  
Rosaline Mishra ◽  
Rama Prajith ◽  
Rajeswari Pradhan Rout ◽  
Jalaluddin Sriamirullah ◽  
Balwinder Kaur Sapra
Keyword(s):  
Physical Properties ◽  
Environmental Conditions ◽  
Test Chamber ◽  
Air Velocity ◽  
Attachment Rate ◽  
Inhalation Dose ◽  
Decay Products ◽  
Calibration Chamber ◽  
Thoron Progeny

Abstract Inhalation doses due to radon and thoron are predominantly due to the inhalation of progeny of Radon and Thoron. The progeny/decay-products of radon and thoron are particulates unlike their parent gas and exhibit different physical properties like attachment to the aerosols and deposition on different surfaces. All these properties in turn depend on the environmental conditions such as air velocity, aerosol concentration, attachment rate, etc. The role of air velocity on deposition on surfaces decides the progeny particles left in the air for inhalation. Therefore, in the present work, we have studied the effect of air velocity on the inhalation dose due to radon and thoron progeny at the centre of a 0.5-m3 calibration chamber as well as on all surfaces. Hence, the studies were carried out at different air velocities, and inhalation doses were measured using deposition-based direct radon and thoron progeny sensors.

NATURAL RADIATION EXPOSURE TO THE PUBLIC IN MINING AND ORE BEARING REGIONS OF CAMEROON

2019 ◽  
Vol 184 (3-4) ◽  
pp. 391-396 ◽  
Author(s):  
Saïdou ◽  
Shinji Tokonami ◽  
Masahiro Hosoda ◽  
Ndjana Nkoulou II Joseph Emmanuel ◽  
Naofumi Akata ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Indoor Radon ◽  
Natural Radionuclides ◽  
Survey Method ◽  
Natural Radiation ◽  
Joint Research ◽  
The Public ◽  
Activity Concentrations ◽  
Joint Research Project ◽  
Thoron Progeny

Abstract Within the framework of a joint research project on natural radiation exposure and its health effects in Cameroon from 2014 to 2017, the Institute of Geological and Mining Research and the Hirosaki University worked together to carry out natural radiation survey in mining and ore bearing regions of Cameroon. Air kerma rates were measured using car-borne survey method. In-situ gamma spectrometry was used to determine activity concentrations of 238U, 232Th and 40K in soil. A total of 450 RADUET detectors and 350 thoron progeny monitors were deployed in dwellings of the study areas for 2–3 months, collected and analysed. Although natural radioactivity level seems to be normal in most of the surveyed areas, there are many points where activity concentrations of natural radionuclides are largely above the world average values. Indoor radon, thoron and thoron progeny results show the importance to put in place the national radon plan in Cameroon. It was also pointed out that thoron cannot be neglected when assessing inhalation dose.

A Survey of Radon and Thoron Progeny for Dwellings in Hong Kong

1997 ◽  
Vol 73 (2) ◽  
pp. 373-377 ◽  
Author(s):  
K. N. Yu ◽  
E. C. M. Young ◽  
M. J. Stokes ◽  
Z. J. Guan ◽  
K. W. Cho
Keyword(s):  
Hong Kong ◽  
Thoron Progeny
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